52:1 David addressed the wicked man directly. He marvelled that he would really boast about his evil since the Lord is so consistently loving. It is inconsistent to return evil to a God who loves loyally and even worse to brag about one's wickedness.
52:2-4 The wicked who oppose God's faithful servants often use their words as weapons to cut them down (cf. James 3:6, 8). Their words are deceitful when they misrepresent the truth. David stressed the fact that the treacherous really love their destructive activity. To destroy is bad enough, but to love to do it is worse.
52:5 Since God had promised to bless the righteous with long life and to punish the wicked with death (Deut. 28), David was confident He would slay the deceiver eventually.
52:6-7 The punishment of the wicked would delight the righteous, not because they had suffered, but because God would have judged righteously. The person who does not trust in the Lord trusts in himself. He builds a refuge for himself often out of material things, but it always proves inferior to God Himself.